Straight(ish) Cave Passages

Here's the latest four cave tiles ...two of which (the pit and the rubble) were suggested by Drew.

However, I've taken Drew's suggestion one step further (unless I misunderstood, and this is what he meant all along :) ), and drawn the two 'feature tiles' in such a way that they can also be placed one atop the other.

Here's what I mean...

...and as you can (hopefully) see, we can use the pit as an access point to a lower section of the cave system (i.e. where the cave floor has given way - revealing another, perpendicular, tunnel below), in addition to using it as a simple pit.

Anyway, here's hoping you guys like them :)